35 mm at the head, 39 and 40 through the middle, 50 at the lower end. Narrow through much of its length, with the width arriving only near the base — the opposite of shapes that are thickest where they first go in. Silicone, and undemanding until the last stretch.
Choose a water-based lubricant; a silicone-based one would slowly degrade the silicone.
Clean it under warm water with an unscented soap and leave it to dry before it is stored.


































